The film plays chronologically to discuss three phases of vertical communal living in a global context: Mud, Concrete, and Glass. At any time, you can mouse “down” in order to explore more in-depth about whatever topic is currently on the screen and when you’re done, you can go right back into the film where you left off. The documentary is image-rich, with oil paintings and historic photographs included throughout. Clicking on an image also includes robust cataloging information.

Although the documentary is “short,” it’s narrations reference major developments in 20th century architecture, especially public housing and urban sprawl.